5,449 research outputs found
Synthetic Topological Degeneracy by Anyon Condensation
Topological degeneracy is the degeneracy of the ground states in a many-body
system in the large-system-size limit. Topological degeneracy cannot be lifted
by any local perturbation of the Hamiltonian. The topological degeneracies on
closed manifolds have been used to discover/define topological order in
many-body systems, which contain excitations with fractional statistics. In
this paper, we study a new type of topological degeneracy induced by condensing
anyons along a line in 2D topological ordered states. Such topological
degeneracy can be viewed as carried by each end of the line-defect, which is a
generalization of Majorana zero-modes. The topological degeneracy can be used
as a quantum memory. The ends of line-defects carry projective non-Abelian
statistics, and braiding them allow us to perform fault tolerant quantum
computations.Comment: 4 pages + references + 3 pages of supplementary material, 2 figures.
reference update
Molecular docking via quantum approximate optimization algorithm
Molecular docking plays a pivotal role in drug discovery and precision
medicine, enabling us to understand protein functions and advance novel
therapeutics. Here, we introduce a potential alternative solution to this
problem, the digitized-counterdiabatic quantum approximate optimization
algorithm (DC-QAOA), which utilizes counterdiabatic driving and QAOA on a
quantum computer. Our method was applied to analyze diverse biological systems,
including the SARS-CoV-2 Mpro complex with PM-2-020B, the DPP-4 complex with
piperidine fused imidazopyridine 34, and the HIV-1 gp120 complex with
JP-III-048. The DC-QAOA exhibits superior performance, providing more accurate
and biologically relevant docking results, especially for larger molecular
docking problems. Moreover, QAOA-based algorithms demonstrate enhanced hardware
compatibility in the noisy intermediate-scale quantum era, indicating their
potential for efficient implementation under practical docking scenarios. Our
findings underscore quantum computing's potential in drug discovery and offer
valuable insights for optimizing protein-ligand docking processes.Comment: 10 pages, 5 figures, All comments are welcom
Cross sections for inelastic + scattering
In the first Born approximation we study the reactions , , , and with quark-antiquark annihilation and creation.
Transition amplitudes are derived with the development in spherical harmonics
of the relative-motion wave functions of the two initial mesons and of the two
final mesons so that parity is conserved and the total angular momentum of the
final mesons equals the one of the initial mesons. Unpolarized cross sections
are calculated from the transition amplitudes that also contain mesonic
quark-antiquark relative-motion wave functions and transition potentials for
quark-antiquark annihilation and creation. Notable temperature dependence of
the cross sections is shown. While the cross sections for ,
, and may be of the millibarn scale, the
cross section for is very small.Comment: more discussions adde
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Dietary Intake of Fatty Acids, Total Cholesterol, and Stomach Cancer in a Chinese Population.
To investigate the associations between dietary fatty acids and cholesterol consumption and stomach cancer (SC), we analyzed data from a population-based case-control study with a total of 1900 SC cases and 6532 controls. Dietary data and other risk or protective factors were collected by face-to-face interviews in Jiangsu Province, China, from 2003 to 2010. Adjusted odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using multiple unconditional logistic regression models and an energy-adjusted method. The joint associations between dietary factors and known risk factors on SC were examined. We observed positive associations between dietary saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), and total cholesterol and the development of SC, comparing the highest versus lowest quarters. Increased intakes of dietary SFAs (p-trend = 0.005; aOR, 1.11; 95% CI, 1.01-1.22 with a 7 g/day increase as a continuous variable) and total cholesterol (p-trend < 0.001; aOR, 1.13; 95% CI, 1.06-1.22 with a 250 mg/day increase as a continuous variable) were monotonically associated with elevated odds of developing SC. Our results indicate that dietary SFAs, MUFAs, and total cholesterol are associated with stomach cancer, which might provide a potential dietary intervention for stomach cancer prevention
Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1
The Swift/XRT light curve of the ultraluminous X-ray (ULX) source NGC 5408
X-1 was re-analyzed with two new numerical approaches, Weighted Wavelet
-transform (WWZ) and CLEANest, that are different from previous studies.
Both techniques detected a prominent periodicity with a time scale of
days, in excellent agreement with the detection of the same
periodicity first reported by Strohmayer (2009). Monte Carlo simulation was
employed to test the statisiticak confidence of the 115.5-day periodicity,
yielding a statistical significance of (or ). The robust
detection of the 115.5-day quasi-periodic oscillations (QPOs), if it is due to
the orbital motion of the binary, would infer a mass of a few thousand
for the central black hole, implying an intermediate-mass black hole
in NGC 5408 X-1.Comment: 6 pages, 2 figures, submitted to Research in Astronomy and
Astrophysics (RAA
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